service unvailable

When I work locally (html and javascript on my PC) calling the webservice on a remote pc, it is successfully working. However, when I put the htm & javascript on another pc and I open the page using ip of other pc, I am getting "Service unavailable" error!

If the code is working on one and not from other the problem does not look like to be with the code but it looks like your web server is not configured correctly. Refer to Service Unavailable error I once faced and found a solution to that problem.